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26 Oct 1998

Volume 73, Issue 17, pp. 2393-2529

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Electromechanical coupling coefficient for surface acoustic waves in proton-exchanged 128°-rotated Y-cut lithium niobate

D. Čiplys and R. Rimeika

Appl. Phys. Lett. 73, 2417 (1998); http://dx.doi.org/10.1063/1.122452 (3 pages) | Cited 4 times

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The attenuation of surface acoustic waves propagating along crystallographic X axis in proton-exchanged 128° rotated Y-cut lithium niobate during the evaporation of copper film on the crystal surface has been measured as a function of sheet resistivity of the film. From the magnitude of attenuation maxima, the effective electromechanical coupling coefficients for samples with different thicknesses of HxLi1−xNbO3 layers have been evaluated, and from the position of maxima in the resistivity scale, the effective dielectric permittivities of the structure have been estimated. The electromechanical coupling coefficient is found to be reduced practically to zero with increasing thickness of protonated layer and acoustic frequency, and the dielectric permittivity is not significantly affected by the proton exchange. © 1998 American Institute of Physics.
Show PACS
77.65.Dq Acoustoelectric effects and surface acoustic waves (SAW) in piezoelectrics
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
43.35.Pt Surface waves in solids and liquids
68.35.Gy Mechanical properties; surface strains
77.22.Ch Permittivity (dielectric function)
42.79.Jq Acousto-optical devices
82.30.Hk Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
73.61.Ng Insulators
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